DESIGN OF CHAOTIC BIFURCATION PARAMETER MODULATION SCHEME USING MEAN VALUE ESTIMATION

Abstract

Chaotic modulation schemes has proved to be an efficient wideband modulation schemes due it itscomparable performance to spread spectrum systems. The ergodic chaotic parameter modulation scheme(ECPM) is one of such schemes. However, the conventional ECPM uses sophisticated techniques to estimatethe bifurcation parameter which increase the demodulator complexity. In this paper, a mean value estimationtechnique is proposed for use at the receiver for retrieving the original information to minimize thecomputational complexity. Binary Phase Shift Keying Ergodic Chaotic Parameter Modulation (BPSK-ECPM)scheme is used to modulate the information signal in the bifurcating parameter of the chaotic map. Simulationresults showed that besides the proposed scheme simplifies the demodulator structure, it also improves bit errorrate (BER). For instance, in AWGN channel and at of 10-3, BPSK-ECPM achieves gains in Eb/N0 of 0.7dB and5dB in comparison with conventional direct sequence spread spectrum with BPSK modulation (DS-SS BPSK)and conventional ergodic chaotic parameter modulation spread spectrum (ECPM-SS) systems respectively.The results also confirm that in Rayleigh fading channel and at BER of 10-3, BPSK-ECPM achieves gains inEb/N0 of about 6.3dB and 1.6dB in comparison with DS-SS BPSK and ECPM-SS systems respectively.